a nicely chilled beverage that has reached the brink of warmness; alomst too warm to drink, but not quite. Usually the cup or can still feels cool to the touch, while the beverage contained within is... not so much.
Upon returning from a long meeting, parched after having given an hour-long presentation on the benefits of telecommuting, Dave was pleased to find that his Mountain Dew was still lukecold. "Yuck" his coworkers said as he took a big swig."What? It's still lukecold." Dave replied.